Khan Academy
Khan Academy: Classical Genetics: Co Dominance and Incomplete Dominance
Learn about codominance, where both alleles in the genotype are seen in the phenotype, and incomplete dominance, a mixture of the alleles in the genotype is seen in the phenotype. [3:28]
Bozeman Science
Bozeman Science: Genotypes and Phenotypes
Paul Andersen explains how changes in the genotype of an individual can affect the phenotype. He begins with genotype:phenotype::letters:story analogy. He explains how mutations can be neutral, beneficial or harmful. He also explains how...
Sophia Learning
Sophia: Traits: Lesson 1
This lesson will explain how traits are passed down by alleles, and that one particular genotype determines one particular phenotype. It is 1 of 3 in the series titled "Traits." [1 min. 8 sec.]